Necessary ports and not necessary ports

[Benawi () gmx de]

Hi there,

Need input from you all.
I have a win2003 box, which i want to set it as a domain controller.
I would like to filter the incoming IP via IPSec and secure the system
by closing ports. The box is used for user to log in, active directory
and sharing resources.
But somehow I don't know which ports are necsssary to be opened, when
the box works as domain controller.
Can you tell me which ports necessary to be opened, so that I can
closed all other ports. Or is it save already, when i close all ports except
for ip from the domain?

Suppose I have other box, that works as webserver. All i have to do is
to close all ports except 80. Do I see it correctly?

thank you

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